Crossword Genius

Charles —, US seismologist after whom a scale for expressing the magnitude of an earthquake is named (7)

Ross

I believe the answer is:

richter

(Other definitions for richter that I've seen before include "Physicist" , "Scale for measuring earth tremors" , "Earthquakes are measured on this scale" , "Pianist" , "Seismologist" .)

I've seen this clue in The Mirror.
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